Asphalt preparation



scription proceeds.

Patented May 12, 1942 ASPHALT PREPARATION Robert E. Burk, Cleveland,Ohio, assignor to The Standard Oil Company, Cleveland, Ohio, acorporation of Ohio No Drawing. Application October 28, 1936, Serial No.108,052

8 Claims.

This invention relates to asphalt preparation; and it is among theobjects of the invention to provide a product having durability andresistance to change of properties in service. Other objects andadvantages will appear as the de- To the accomplishment of the foregoingand related ends, the invention, then, comprises the featureshereinafter fully described, and particularly pointed out in the claims,the following description setting forth in detail certain illustrativeembodiments of the invention, these being indicative however, of but afew of the various ways in which the principle of the invention may beemployed.

The invention will be best understood by reference to an illustrativeexample:

A petroleum residuum, as a pipe still bottoms of Mid-Continent petroleumleft after the various cuts have been taken off through librucatingfractions, and having for instance a flash point of 550 F., andpenetration of about 200 at 77 F., is subjected to oxidation by blowingwith air, and maintaining an effective temperature of 400-550" F.,material shows desired characteristics, as for example 12 to 25penetration at 77 F., and melting point 150-235 F., the oxidizingprocess requiring many hourrs, for instance 2 to 24 hours, dependingsomewhat upon the. constancy of maintenance of action. With the axidizedmaterial there is finally incorporated, whileit is in suflicientlyfluent condition, 0.1 per cent of a naphthenate of a heavy metal, ascobalt, manganese, iron, lead, vanadium, or zinc, being thoroughlydisseminated.

While the naphthenic salts are particularly desirable, I may in someinstances employ salts of oleic, linoleic, tung acids, and syntheticcarboxylic acids made by oxidizing petroleum, with metals as aforesaid.

In general, the amount of the naphthenic or other salt is small, forinstance 0.001-1 per cent. The agent, it is noted also, is to be addedafter active reaction has passed in the asphalt, or at least if addedbefore there must be suflicient to insure the finished productcontaining an amount of the metal compound as indicated.

I have found further that the action of the salts of the heavy metals asaforesaid, is promotive with respect to each other, and a mixturethereof yields results out of proportion to and much greater than thetotal of the respective individuals entering into the mixture. Thus,such mixtures as cobalt naphthenate and mansamples being taken until theganese linoleate or tungate, or the lead salts of synthetic carboxylicacids made by oxidizing petroleum, as now commercially available, may beemployed with zinc oleate or linoleate. And, variously, mixtures of thesalts may be employed as desired.

If the agent is added before oxidation is complete, I have found furtherthat the heavy metal in the form of reactive hydroxide or oxide orhydrous oxide may advantageously be employed instead of or in additionto the pre-formed salt of the metal. Incorporation thus of amounts ofcobalt hydroxide, zinc oxide, litharge and like compounds of the saidheavy metals reactive with carboxylic acids are desirable, reaction bythe oxidation acids formed by the action of the oxygen in the blowingprocess on the petroleum hydrocarbons zyielding corresponding amountsofsalts of the metals to become effective as if added pre-formed.

Asphalts in accordance with the invention show a particularly goodsurface after application to point of usage, as in exposure on roofing,walls, and other surfaces, the customary tendency heretofore of asphaltto develop surface cracks, and also generally rapidly accumulate acoating of dust and dirt, being absent.

Other modes of applying the principle of the invention may be employed,change being made as regards the details described, provided thefeatures stated in any ofthe following claims,

.or the equivalent of such, be employed.

I therefore particularly point out and distinctly claim as my invention:

l.'A process of making asphalt, which consists in oxidizing petroleumresiduum by heating and agitating in exposure to oxygen and thickeningthe material to desired melting point and penetration, and after suchoxidizing incorporat ing a small amount of a naphthenate of a metal ofthe group consisting of cobalt, manganese, iron, lead, vanadium andzinc.

2. A process of making asphalt, which consists in heating and agitatingpetroleum residuum in. exposure to oxygen and thickening the material todesired melting poin and penetration, and after such oxidizingincorporating a small amount of a salt of a carboxylic acid of the groupconsisting of naphthenic, oleic, linoleic, tung acids and oxidizedpetroleum acids, with a metal of the group consisting of cobalt,manganese, iron, lead, vanadium and zinc.

3. A process of making asphalt, consisting in oxidizing petroleumresiduum by heating in exposure to oxygen and thickening the material todesired melting point and penetration, and after such oxidationincorporating a small amount of mixed salts of acids of the groupconsisting of naphthenic, oleic, linoleic, tung acids and oxidizedpetroleum acids, with metals of the group consisting of cobalt,manganese, iron, lead, vanadium and zinc.

4. A process of making asphalt, consisting in oxidizing a petroleumresiduum by heating in exposure to oxygen and thickening the material,and then incorporating a small amount of a compound of a metal of thegroup consisting of cobalt, manganese, iron, lead, vanadium and zinc.

5. A process of making asphalt, consisting in oxidizing petroleumresiduum by heating in exposure to oxygen and thickening the material,and then incorporating a small amount of a reactive compound of thegroup consisting of oxides, hydroxides, and hydrous oxides of metals ofthe group consisting of cobalt, manganese, iron, lead, vanadium andzinc.-

6. Asphalt, consisting of oxidized asphalt and a small amount of anaphthnate of a metal of the group consisting of cobalt, manganese,iron, lead, vanadium and zinc.

7. Asphalt, consisting of oxidized asphalt and a small amount of a saltof an acid of the group consisting of naphthenic, oleic, linoleic andtung acids with a metal of the group consisting of cobalt, manganese,iron, lead, vanadium and zinc.

8. Asphalt, consisting of oxidized asphalt and a small amount of amixture of salts and acids of the group consisting of naphthenic, oleic,linoleic, tung acids and oxidized petroleum acids, with a metal of thegroup consisting of cobalt, manganese, iron, lead, vanadium and zinc.

ROBERT E. BURK.

